Migrate to using docusaurus, rather than docsify for documentation (#603)

* Add docusaurus documentation (to replace the docsify setup
* Remove older docs
* Specify documentation as the gh pages build action working directory

documentation/src/components/HomepageFeatures/index.js

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+import clsx from 'clsx';
+import Heading from '@theme/Heading';
+import styles from './styles.module.css';
+
+const FeatureList = [
+  {
+    title: 'Connect your knowledge',
+    Svg: require('@site/assets/img/mountains-lake.svg').default,
+    description: (
+      <>
+        Khoj can understand your PDFs, markdown, org, and other plaintext files. Connect your knowledge base using one of our <a href="https://khoj.dev/downloads">desktop apps</a> or <a href="/docs/category/clients">other client apps</a>.
+      </>
+    ),
+  },
+  {
+    title: 'Simplify your thinking',
+    Svg: require('@site/assets/img/lightbulb-plant.svg').default,
+    description: (
+      <>
+        Get your knowledge base out of your head and into Khoj. Khoj is a tool for thinking, learning, and making things.
+      </>
+    ),
+  },
+  {
+    title: 'Run privately',
+    Svg: require('@site/assets/img/folder_security.svg').default,
+    description: (
+      <>
+        You can run Khoj on your own computer, or on your own server. All of our code is open source, and you can <a href="/docs/get-started/setup">set it up</a> in minutes.
+      </>
+    ),
+  },
+];
+
+function Feature({Svg, title, description}) {
+  return (
+    <div className={clsx('col col--4')}>
+      <div className="text--center">
+        <Svg className={styles.featureSvg} role="img" />
+      </div>
+      <div className="text--center padding-horiz--md">
+        <Heading as="h3">{title}</Heading>
+        <p>{description}</p>
+      </div>
+    </div>
+  );
+}
+
+export default function HomepageFeatures() {
+  return (
+    <section className={styles.features}>
+      <div className="container">
+        <div className="row">
+          {FeatureList.map((props, idx) => (
+            <Feature key={idx} {...props} />
+          ))}
+        </div>
+      </div>
+    </section>
+  );
+}

documentation/src/components/HomepageFeatures/styles.module.css

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+.features {
+  display: flex;
+  align-items: center;
+  padding: 2rem 0;
+  width: 100%;
+}
+
+.featureSvg {
+  height: 200px;
+  width: 200px;
+}